<template>
  <div>
    <!-- 头部面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <!-- 栅格系统 -->
      <el-row>
        <el-col :span="10">
          <el-button type="primary" @click="showCateDialog">添加商品</el-button>
        </el-col>
      </el-row>

      <tree-table
        class="tree"
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true">
          <!-- 是否有效 -->
          <template slot="isok" slot-scope="scope">
            <i class="el-icon-circle-check"
              v-if="scope.row.cat_deleted === false"
              style="color:lightgreen"></i>
            <i class="el-icon-circle-close" v-else
              style="color:red"></i>
          </template>
          <!-- 排序 -->
          <template slot="order" slot-scope="scope">
            <el-tag type="primary" v-if="scope.row.cat_level === 0">一级</el-tag>
            <el-tag type="success" v-if="scope.row.cat_level === 1">二级</el-tag>
            <el-tag type="warning" v-if="scope.row.cat_level === 2">三级</el-tag>
          </template>
          <!-- 操作 -->
          <template slot="opt">
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
          </template>
      </tree-table>

      <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="queryInfo.pagenum"
          :page-sizes="[3, 5, 10, 15]"
          :page-size="queryInfo.pagesize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
        </el-pagination>
    </el-card>

    <!-- 添加分类 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addDialogClose">
      <!-- 主体 -->
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <!-- options 操作数据源 -->
          <!-- props 用来指定配置对象 -->
            <el-cascader
              v-model="selectedKeys"
              :options="parentList"
              :props="{
                expandTrigger: 'hover',
                checkStrictly: true,
                value: 'cat_pid',
                label: 'cat_name',
                children: 'children'
              }"
              @change="handleChange">
            </el-cascader>
        </el-form-item>
      </el-form>
      <!-- 按钮 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      cateList: [],
      total: 0,
      // 表格的列
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      addCateDialogVisible: false,
      addCateForm: {
        cat_pid: 0,
        cat_name: '',
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      parentList: [],
      selectedKeys: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      this.cateList = res.data.result
      this.total = res.data.total
    },
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    addDialogClose() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    addCate() {
      // console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败!')
        }
        this.$message.success('添加分类成功!')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    showCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级列表失败')
      }
      this.parentList = res.data
      console.log(this.parentList)
    },
    handleChange(selectedKeys) {
      console.log(selectedKeys)
      if (selectedKeys.length > 0) {
        this.addCateForm.cat_pid = selectedKeys[selectedKeys.length - 1]
        this.addCateForm.cat_level = selectedKeys.length
        console.log(this.addCateForm.cat_pid)
        console.log(this.addCateForm.cat_level)
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    }
  }
}
</script>

<style lang='less' scoped>
.tree{
  margin-top: 15px;
}
.el-cascader{
  width: 100%;
}
.cascader{
  height: 300px;
}
</style>
